Form vibrator



March 21, 1959 E, c co 2,501,158

FORM VIBRATOR Filed Sept. 20, 1948 INVENTOR FRANK E. CHILCOTT ATTORNEYPatented Mar. 21, 1950 FORM VIBRATOR Frank E. Chilcott, Glendale,(lalif., assignor to Viber Company, a corporation of CaliforniaApplication September 20, 1948, Serial No. 50,088

3 Claims.

This invention relates to a vibrator for attachment to forms for moldingconcrete.

One object of the invention is to provide a com pact vibratory deviceadapted for use on forms for molding concrete. Another object is toprovide a form vibrator actuated b compressed air. Another object is toprovide means for cooling a vibratory mechanism adapted for use on formsfor concrete construction.

These and other objects are attained by my invention which will beunderstood from the following description and the accompanying drawingsin which Figure 1 is a side elevational view partly in section showing apreferred form of my vibrator;

Figure 2 is a cross-sectional View taken on the line 2-2 of Figure 1;

Figure 3 is a cross-sectional view taken on the line 33 of Figure 1;

Figure 4 is a fragmentary side elevational view taken from the position4 4 of Figure 1;

Figure 5 is a side elevational view showing the mounting of my vibratoron a concrete pipe form; and

Figure 6 is a top plan view of the arrangement shown in Figure 5.

Referring to the drawings which show a preferred form of my vibrator forconcrete construction forms, a cylindrical housing H is provided with atop plate l2 and a bottom plate 13 held together by bo ts it spaced inholes adjacent the outer edges of the circular top and bottom plates andextending therebetween. A compressed air motor indicated generally at i5 is mounted within the cylindrical housing ll, being spaced from thetop plate 12 b the annular support member l6 and supported on thecentral support member I7, which is spaced laterally from the walls ofthe housing H. The air motor consists of the shaft I8 mounted in topbearings H) which are supported by the motor top cover plate 2!]. At thebottom of the air motor, the shaft I8 is supported for rotation in thelower air motor bearing 2| which is mounted on the motor bottom plate22. The motor cylinder 23 is arranged with its inside cylindricalsurface oriented eccentrically with respect to the motor shaft it, beingheld in position between the motor top cover plate 20 and the motorbottom plate 22 in the recesses 24 and 25 respectively which areprovided on the Opposed r inside faces in said top and bottom plates.The rotor 26 which is keyed to the shaft I8 by the key 21 is providedwith four radial slots 28 extending for the full length of the rotorfrom the top to cylinder 23. Radially moving vanes 29 are provided inthe slots 28, these vanes being of sunlcient length to at all timesclose the gap between the periphery of the rotor and the inner wall ofthe motor cylinder '23. The vanes 29 are preferably made of compressedhard fiber and are fitted to slide easily in the radial slots 28 so thatthey will be fully extended against the inner wall of the motor cylinderby centrifugal force when the motor is revolved. Compressed air isadmitted to the motor from inlet openings 30 arranged in a vertical rowin the wall between the inside cylinder wall and the inlet duct 3! whichis in communication with the inlet fitting 32. The motor cylinder 23 isalso provided with a pluralit of outlet ports 33 through the cylinderwalls at positions generally opposite the inlet openings, and arrangedin the well known manner of vane motor exhausts. The air leaving theoutlet port 33 is discharged into the annular space 34 around the airmotor cylinder 23 and, as will be described later, around the vibrator.

The vibrator consists generally of an eccentrically mounted weight 36mounted on a vibrator shaft 3'! which is supported in an upper vibratorbearing 38 mounted in the central support member l1, and in a lowervibrator bearing 39 mounted in the vibrator support 40, which rests uponthe bottom plate i 3. The vibrator shaft 31 is operatively connected tothe air motor shaft I 8 by a piece of connecting shaft 42 with keys 43,this arrangement permitting easy disassembly and compensating forunequal expansions. The shafts of both eccentric weight and motor may beunitary. The eccentric weight 36 is enclosed by the sleeve 44 which fitsinto an end peripheral groove 45 in the central support member ii and inthe end peripheral groove 46 in the lower vibrator support 48. Theannular support member Hi, the central support member ii, the lowervibrator support 40, the sleeve 44, the motor top plate 20, the motorbottom plate 22, and the motor cylinder 23 are all fitted and heldtogether by the bolts l4 extending between the top plate 12 and thebottom plate l3 of the assembly, 0 rings being provided as indicated at41 to prevent leakage of air and lubricant.

The air exhausted from the air motor passes from the annular space 34outside the motor cylinder 23 into the annular space between the insidewall of the housing H, then into the annular space 4! around the centralsupporting member i1, then into the annular space 35 around the sleeve44, and the lower vibrator support 10,

the bottom of the working chamber of the motor finally being dischargedthrough discharge slots to the form in which concrete is to be molded,

and during and after the filling of the mold with wet, unset concrete,the vibrator is operated by compressed air until the concrete mass hasbeen satisfactorily compacted. The vibratory device may then be moved toanother form or another position.

The advantages of my vibratory device will be readily understood fromthe above description of its construction and use. The wearing parts maybe readily r newed and replaced in this device because of the simplicityof its assembly and dis assembly. The unit is compact, portable, isrugged enough to withstand the type of rough service to which it issubjected. t produces strong vibrations for long periods of time withoutoverheating, even when attached to heavy forms, because of theutilization of the exhaust air from the air motor as cooling meansaround the moving parts.

I claim:

1. A vibratory device adapted for vibrating concrete construction formscomprising a housing including means for detachably mounting said deviceto a form; a compressed air motor spaced away from the walls of saidhousing b t within said housing, said motor having its shaft extendingthrough said motor into an eccentric weight chamber; an eccentric weightrotary vibrator means arranged in end-to-end axial relation with saidmotor within said housing, the shaft of said eccentric weight beingrigidly connected to the shaft of said motor; and ducts around saidmotor and said vibratory means connected to the outlet ports of saidmotor and adapted to provide cooling means for said motor and saidvibratory means.

2. A vibratory device adapted for vibrating concrete construction formscomprising a housing including means for attaching said device to aform; an air vane motor within and spaced from the walls of saidhousing, said motor having its shaft extending through said motor intoan eccentric weight chamber; inlet means adapted to convey compressedair to said motor;

motor exhaust ports for said motor adapted to discharge air into thespace between said motor and said housing; an eccentric weight chamber a'ranged in endto-end axial relation with said motor, and having an outerwall spaced away from the inner walls of said housing; an ofi-centerWeight in said chamber rigidly attached to the said extension of saidshaft; conduit means for carrying the exhaust air from the motor exhaustports to the space surrounding said motor and said chamber; anddischarge ports for said ex; haust air through said housing adjacent theen% containing said vibratory means, said discharg ports beingdistributed around said housing at the end remote from said motor.

3. A vibratory device adapted for vibrating for concrete constructioni'orms comprising a housing including means for attaching said device toa form; a compressed air intake in one end of said housing; an air vanemotor within and spaced from the walls of said housing, said motorhaving its shaft extending through said motor into an eccentric weightchamber; upper and lower bearings for said shaft at the ends of saidmotor; inlet ports connected to said air intake adapted to conveycompressed air to said motor over said upper bearing; motor exhaustports for said motor adapted to discharge air into the space betweensaid motor and said housing; an eccentric weight chamber arranged inend-toend axial relation with said motor, and having an outer wallspaced away from the inner walls of said housing; an oif-center weightin said eccentric weight chamber rigidly attached to the said extensionof said shaft; earings for said shaft at the ends of said w ightchamber; conduit means for carrying the exhaust air from the motorexhaust ports to the space surrounding said motor and said weightchamber; and discharge ports for said exhaust air through said housingadjacent the end containing said vibratory means, said discharge portsbeing distributed around said housing at the end remote from said motor.

FRANK E. CHILCO'IT.

REFERENCES CITED The following references are of record. in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,858,855 Haas May 17, 19322,148,722 Baily Feb. 28, 1939

